Echolocation

Hi everyone

So today we are talking about echolocation. This is the skill that over one thousand species depend upon to navigate, hunt and avoid obstacles in pitch blankness.

In dolphins and whales, they push air through nasal passages to create the sound which is then concentrated in the melon, which is a blob of fat in the forehead. The sound is made clearer. When the sound hits something, it gets reflected and the echo is then sensed by the dolphin or whale’s lower jaw. It passes through the jaw to the ear and the brain determines size, density, distance, direction and speed. By doing this some species could detect a golfball a football pitch away. They can also tell different fish species apart.

In most bat species, the sound is made in the larynx and is so high-pitched that it is above the human hearing range. It can be up to 140 decibels loud, meaning that the bats have to temporarily ‘turn off’ their hearing before quickly turning it back on to be able to hear the echos. Some bats can detect and avoid wires that are as thin as human hairs and find insects 5m away.

There are many other species that use echolocation such as small mammals, birds and even humans! Some blind or visually impaired people have learnt to make clicking sounds with their tongues or an object, such as a walking stick, and listen to the echos to locate tables, chairs, doors and windows. This is just another great example of people learning from nature!

Your Green World Blog Team💚

Sources:

https://www.discoverwildlife.com/animal-facts/what-is-echolocation/

https://www.nationalgeographic.com/animals/article/echolocation-is-nature-built-in-sonar-here-is-how-it-works

Images:

Dolphins: This image, owned by Ricardo Liberato (on flickr.com) is licensed under CC BY-SA 2.0.

Comments

Coral reefs

Hello! We would love to introduce you to the topic of coral reefs and especially coral reef bleaching, as it is a greatly ignored but certainly significant topic. Have fun! 5 coral reef facts 1. The Great Barrier Reef is the largest living structure on the planet and is 2300 km long! 2. Less than 0.1% of the world's ocean surface is covered in coral reefs. 3. At least 25% of all marine animals live there. 4. Coral reefs are often known as the rainforests of the ocean. 5. In 1 square kilometre of coral reef, up to 35 tons of fish can be 'produced'. The 5 biggest coral reefs in the world 1. Great Barrier Reef (near Australia) 2. Red Sea Coral Reef (near Egypt, Israel and Djibouti) 3. New Caledonia Reef (Pacific Ocean near New Caledonia) 4. The Mesoamerican Barrier Reef (near Mexico, Belize, Guatemala and Honduras) 5. Florida Reef (Atlantic Ocean/Gulf of Mexico near Florida) What is coral? Coral is actually made up of small anim...

18.10.20 Animal Of The Week: Sloth

Hello, Sorry this didn't come out on Sunday as planned but this week's animal of the week is the sloth because the twentieth of October is Sloth Day. Habitat The sloth resides in Central and South America. It lives in the rainforests there and occasionally drops into the water for a bathe as, believe it or not, they are actually excellent swimmers! Diet Sloths eat leaves, twigs and buds which they find in the rainforest. As they don't have incisors they smack their lips together to make leaves more digestible. Sloths can survive on relatively little food as it takes a while for them to digest it. Sleep and Speed When you think of a sloth, you probably think of this slow, sleepy creature. They actually sleep for about 15 hours a day! Sloths have an extremely low metabolic rate (what basic calories your body needs to survive), which means they move at a slow pace through the trees. On average, sloths travel 40 yards per day ...

Photo Essay || Iceland Series (part 1)

Hi Everyone! I recently went on a school trip to Iceland! It was such an incredible experience (and I'm going to sound cheesy now) but it was also incredible to do it with some of my closest friends! I saw so many incredible things and learnt so much, so I couldn't resist sharing a little Iceland mini series of posts, all about Iceland, both my experiences there and what I saw, but also the way it uses geothermal energy, and the animals, natural landforms and plants that are there. Today I'm sharing some photos of my trip. These are all photos I have taken, and are also the highlights so please bear that in mind as you browse these! I hope it is interesting and inspires you to book a trip to Iceland! The blue lagoon <33 landscapes.... Lost little farmhouses a...

Turning waste into valuables

Hi, So this post was requested on Twitter after our September Top Tips about recycling . Today we will be talking about how to turn complete waste into something reasonably valuable. This is basically a form of upcycling but to a more extreme level. 1. Ecobricks So, almost a year ago we did a post about ecobricks , but they are such a good example of turning waste into valuables that we decided to put it here anyway. Ecobricks are a building material made from plastic. The waste plastic is washed and then compacted into a clean plastic bottle (also waste). The bottle becomes very hard and durable. Multiple bottles can then be used as bricks and cemented together. The 'bricks' are strong and do not decompose. For more info, read our post where we go into more detail. 2. Metals Although this may seem like something not worth the time. When you separate the metals in waste (for example an old car), you can get usable metal out ...

December Factfile

Hello, The fact file vote has come to an end and we have a winner. This year, we will be doing top tips. These will come out at the beginning of the month. These tips are, at the same time, challenges. We hope you will enjoy, and apply them! News Good news New hope for coral reefs A coral reef in India has been restored to health- the proof being in the noises the fish have been making. Many of these strange sounds have never been recorded before. This is amazing, especially considering that the reef has been devastated by blast fishing, where explosives are used to stun or kill everything in the area. Although the corals are being restored, scientists want to know if the animals are also returning and in what numbers. The Guardian states that 'Sound is vital for reef survival, because almost all of its inhabitants, from corals to crustaceans to fish, produce offspring that spend the early part of their lives in the open oceans, before us...

15.11.2020 Animal Of The Week: Red Squirrels

Hello Everyone, This week's animal of the week is the red squirrel. There are lots of different types of squirrel (about 200 as this includes marmots and prairie dogs). I have some grey squirrels in my garden and you might too. We often see them so hopefully you can learn about red squirrels today. Habitat As you might know, squirrels live mainly in woodland areas. The red squirrel can live in all types of woodland, even if it is quite small. See the maps below for more information on where they live. Diet They feed on mainly nuts, fruit, fungi and other plants. They need to chew as their teeth grow continuously and so can grow so long that they can't eat if they don't chew often. When food is scarce they can eat some insects and small vertebrates. What is thought of them Squirrels are sometimes seen as pests, but not usually as much as many other rodents. They can raid bird feeders (they manage to get in to mine even if ...

4 tips for eco-eating

Hi everyone, Today we are going to be sharing some tips for making sure that what you are eating is environmentally friendly. 1. Check for Palm Oil As you can probably tell from past posts, we are strongly against using palm oil . Palm oil is often used in food products, so by quickly glancing over the ingredients list on the product's packaging, you can make sure that no rainforest has been cut down to make it. For instance, we would recommend buying "McVites Digestive light" instead of the classic version as it was specifically designed to not contain palm oil. 2. Shop Locally The shops in your local area will probably get their produce from local sources, so by buying your food from them will ensure that no CO2 has been produced from shipping, as well as supporting the local community. Some shops have recently started to serve dry ingredients (such as flour and sugar) in paper bags or in your own containers, which leads onto... ...

Killing invasive species: necessary?

Hi everyone, Today's topic is a rather controversial one: is killing invasive species necessary? We'll take it apart for you to come up with your own opinion. Enjoy! Definition Firstly, let's clarify what an invasive species is. An invasive species is a species that is not native and most likely causes harm to the ecosystem where it now lives. This does not include animals that migrate to another area. Why is it a problem? Depending on the species and the ecosystem, invasive species can cause a lot of harm to their surroundings. Often invasive species have no predators in their new habitat and reproduce in such large numbers that they massively overpopulate, causing death for other species. Or they bring sicknesses the local animals are not accustomed to, and that kills them. For example black and brown rats are an invasive species on the Galapagos Islands : Black and brown rats were introduced to the Galapagos Islands in the 17th ce...

Metamorphosis

Hello! Today we thought it would be good to explain exactly how metamorphosis works. It's a term that we often use when talking about frogs, butterflies or other animals, but we've never actually explained what it is or how it works. What is metamorphosis? Metamorphosis is the term used to describe the changes that some animals undergo when turning into adults. It is a physical change that happens after birth/hatching. There is a brilliant quote from the website a-z animals that I just couldn't put any better: unlike the typical subtle developments in animals, metamorphosis is dramatic. It’s controlled by a release of hormones in the cells. Mammals usually move from adolescence to adulthood and old age gradually, maintaining their form and shape. However, in metamorphosis, an animal moves through those stages and changes from one form or shape to another. How does metamorphosis work? Let's take the classic butterfly example./d...

March Top Tips // 10 little things you can avoid in daily life

Welcome to the Top Tips this month! We'll be talking about 10 things you can avoid using in everyday life. We know it's a really simple topic, but it can actually make quite a difference. The avoidable stuff will be things many use because they look nice or taste nice or similar, but aren't actually necessary. We will also write a couple of facts on these things, and give ideas on how you could substitute them if possible. Many might be very obvious, but think about it, do you actually not use them? Have fun! Chewing Gum Most people would not be surprised when told that lots of chewing gum have synthetic colouring and flavouring. However, most people would be surprised when told that chewing gum is largely made of plastic. What the companies call the "gum base" is plastic and partly made of the same stuff plastic bags are made of. The gum contains microplastics that, if you spit your gum on the ground often tend to get into the oce...

Green World

Search This Blog